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Derivatives - Impact of Derivative Instruments on Income Statement (Details) - Foreign currency contracts - Other income, net - Not Designated as Hedging Instrument - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Unrealized gain (loss) on foreign currency contracts	$ 386	$ (634)	$ (64)
Realized gain (loss) on foreign currency contracts	1,661	(1,699)	(296)
Total net gain (loss) on foreign currency contracts	$ 2,047	$ (2,333)	$ (360)

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

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- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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